Porous reduced graphene oxide oil absorption material with controllable doping level and preparation method thereof

Abstract

The invention discloses a porous reduced graphene oxide oil absorption material with a controllable doping level and a preparation method thereof. The porous reduced graphene oxide oil absorption material with the controllable doping level is of a hierarchical porous structure stacked layer by layer; a reduced graphene oxide aerogel is adopted as a substrate; and amino acid is doped in a framework of the reduced graphene oxide aerogel. The preparation method provided by the invention comprises the steps of firstly mixing graphene oxide and an amino acid reducing agent dissolving solution; then obtaining a reduced graphene oxide hydrogel through a high pressure hydrothermal method; and finally, washing the hydrogel, freezing at low temperature for pore-forming, and obtaining the porous reduced graphene oxide oil absorption material. The oil absorption material provided by the invention has favorable hydrophobicity, has a better adsorption capacity on an oil product and an organic pollutant, and achieves the aim of oil-water separation in an oil-water composite environment; and meanwhile, pore diameter distribution and a pore structure of the material can be regulated and controlled through the control on the doping level, the selective oil absorption of the material is promoted, and the selective adsorption of the oil product is realized.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a porous reduced graphene oxide oil-absorbing material with a controllable doping degree and a preparation method thereof. Background technique [0002] Graphene airgel has a high specific surface area and multi-level pore structure characteristics, and has a wide range of applications in the fields of supercapacitors, lithium batteries, catalysis, and adsorption. The adsorption of oil-absorbing materials is very effective in the treatment of marine oil spills and organic pollutants. Due to its high efficiency, economy, and easy recovery of oil and organic matter, it is widely used in emergency treatment of marine oil spill pollution accidents. However, traditional oil-absorbing materials have various disadvantages in practical applications due to their poor hydrophobicity, low oil absorption rate, potential biological toxicity, and difficulty in recycling. Ther...

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Problems solved by technology

However, although traditional graphene airgel oil-absorbing materials have the ability to adsorb oil and organic pollutants, their selectivity to oil is poor due to their uneven pore size and poor repeatability.

The reductive assembly process of amino acid chemicals on graphene oxide is rarely reported, and the doping degree of the prepared reduced graphene oxide airgel is usually uncontrollable

The doping degree of the chemical reducing agent will affect the oil absorption performance and mechanical properties of the material. Therefore, how to obtain the reduced graphene oxide aerogel with a controllable doping degree can better complete the development of the graphene oxide aerogel. Selective oil absorption remains a great challenge

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